Linkage for model-forming discs

ABSTRACT

An apparatus for constructing molecular models having, as atomrepresenting members, both single discs and interengaged mutually perpendicular double discs and, as chemical bond-representing members, hollow tubes which are frictionally received over valence-representing recessed nibs on the discs.

United States Patent [72] Inventor Malcolm E. Kenney 1203 Hereford Road, Cleveland Heigh Ohio 44118 [21] Appl. No. 771,121 [22] Filed Oct. 28, 1968 [45] Patented May 4, 1971 [54] LINKAGE FOR MODEL-FORMING DISCS 1 Claim, 5 Drawing Figs.

[52] U.S.Cl 35/18, 46/31 [5 1] Int. Cl 60% 23/26 [50] Field of Search 35/I8.5; 46/23, 30, 31, 25

[56] References Cited UNITED STATES PATENTS 927,499 7/1909 Davis 46/30X 1/1947 Carson 7/ l 948 Wiswesser 4/l953 Nelson 5/1958 Carson.... 4/1965 Beck FOREIGN PATENTS 12/1966 East Germany Primary Examiner-Harland S. Skogquist Attorney-Robillard & Byrne ABSTRACT: An apparatus for constructing molecular models having, as atom-representing members, both single discs and interengaged mutually perpendicular double discs and, as chemical bond-representing members, hollow tubes which are frictionally received over valence-r on the discs.

epresenting recessed nibs PATENTEU m 4191: 3; 577 660 INVENTOI'? M LC OLM KE NEY B) 444/ AT ORNEYS 1.. LINKAGE FOR MODEL-FORMING Discs The present invention relates to molecular models and more I sembled for display and study from a plurality of flat disc pieces, some of which are individually representative of certain atoms and others of which are paired in mutually perpendicular inter'engagement to represent in certain other atoms. Such disc model kits achieve mod molecular configuration by interconnecting the atom-representing discs and disc pairs together. Although the use ofdiscs for molecular exhibition has vitiated the storage problem associated with the better known molecular model kits which utilize spherical balls for atom-representing members, this invention makes its contribution in providing strength, durability, and facility of assembly.

An important objective of this invention is to provide a molecular model kit which utilizes discs representing the valence state of a particular atom and having recessed tongues for retentively engaging chemical bondrepresenting tubular members. 7

Another important objective of this invention is to provide tube-receiving lugs within the peripheries of the atomrepresenting discs whereby breakage is reduced and aesthetic appearances are enhanced.

A further objective of the invention is to provide atom representing disc pairs which are easily assembled into mutually perpendicular relation by means of radial-slots whose widths are at least as great as the thicknesses of the of the discs throughout the slot lengths are which are interlocked in place by a groove provided intermediate the length of the slot which engages with a boss or lug on the disc surface.

These and other objects of the invention will become more apparent to those skilled in the art by reference to following detailed, description when viewed in light of the accompanying drawings, wherein:

- FIG. 1 is a perspective view of several of the individual comr the discs of FIG. 3; and

FIG. 5 is a perspective view of a methane molecule con I structed with selected components of the kit.

Referring now to the drawings, wherein like numeralsin- .dicate like parts, the numeral indicates a grouping of several of the'components parts which make up the molecular model kit-Quite obviously, the individual number of component parts required to make up a kit is arbitrary and selected to fit the number and variety of molecular models desired to be assembled. it can be seen that because of the '2 the trivalent carbon atom; Other atoms-of like valence may, of course, be represented by similar discs and can be made separately identifiable by asimplemarking orcolor coding system. In each kit there will'be several colors of each type of disc. Because they are used in many atomic representations,

the 14 and types normally predominate.

i The nib 22 and the cutout portions 24 are formed so that the hollow-connecting tube 12 may be forced-fitted over the end of the nib'and, by friction, retentively engaged thereon. For ease of assembly to the disc it hasbeen found that a tube of resilient plastic is used. The tube is sturdy enough to support the discs without flexing along its longitudinal axis, but elastic enough to deform forfrictional receipt on a nib of slightly greater width than the inner diameter of the tube. An illustration of water molecule is shown in FIG. 2 wherein one oxygen-representing disc '16 is connected to type hydrogengreat compactnesses of the unassembled components of the.

instant invention a very large number may be housed in a relatively small container.

The components viewed in FIG. I include aconnecting tube 12 and a variety of discs l4, l6, l8 and 20. Each of the discs is made of a sturdy material such as synthetic plastic and is circular in shape with parallel planar sides. The discs have at of the atom. As an example, the disc 14 is representative of the monovalent hydrogen or chlorine atom while the disc 16 is representative of the divalent oxygen atom and the 18 of representing disc 114 by two bond-representing members 12.

The disc 18 is representative of the trivalent carbon atom such as occurs in graphite. The arrangementof single layers of graphite can easily be shown by connecting a plurality of the Besides facilitatingthe display of molecules with subordinate atoms in a planar configuration, three-dimensional models such as the methane molecule (shown in FIG. 5) can be assembled through the use of a pair of identical discs- 20.

The disc 20 is formed with a slot 26 emanating atits center and extending radially outwardly to its periphery. The slot has parallel planar sides spaced-apart a distance equal to the thickness of the disc throughout its entire length except for the provision therein of an enlarged segment caused by opposed notches 28. An elongated lug 30 is provided on one surface of the disc 20 in a location whereby the length of the lug is bisected by an extension of the longitudinal axis of the radial slot 26. The lug 30 is spaced outwardly from the center of the disc the same distance as the notches 28 and has a width equal to or less than thewidth of the aforesaid notches. The disc 20 is also provided with two tongues 22 evenly spaced on each side of .the lug 30 to form an angle of l09..5.

With the structure of the disc 20 as given and with reference to the drawings, it is easy to see that by juxtaposing two of the discs to a mutually perpendicular relationship with the en trance to their slots 26 adjacent each other, the discs may be moved into mating relation by sliding the discs in he direction of the arrows shown in FIG. 3 so that each of notches 28 on one disc moves toward the lug 30 on the other disc. It can be seen that the snap-locking feature of the instant invention does not'complicate theinitial assemblyoperation. Some the slots 26 are as wide as the thickness of the discs, it is a simple matter to slide the discs together until the lug 30 of each disc abuts'against the periphery adjacent to the entrance, of the slot 26 of the other disc. As shown in FIG. 4 achievement of this stage in theassembly operation before the necessity of an increased amount of assembly pressure results in an already stable partial assemblage to which such increased pressure is easily applied. The relatively small size of the discs in relation to the user allows him to steady the discs by grasping the upper and lower surfaces of one disc between the thumb and forefinger of the right hand until the lugs 30 are traversed and seated in the notch 28. The discs will then be positively interlocked into a mutually perpendicular relation which resists accidental disassembly and which is achieved without bending, twisting or otherwise skillfully manipulating the two discs 20 relative to each other. i v

It is to be understood that the positive interlocking feature attained by the assembled discs 20 prevents any relative movement lineally or pivotally therebetween with respect to their common diametn'e'al axis. Lineal movement in either direction along the aforesaid common axis is prevented since the lug $0,

upstanding from the surface of one disc, abuts against the the slot .26 of the one abuts against the inner end of the slot of jacent the entrance to their slots 26. Again, this operation is best a accomplished by holding one disc in the left hand as before, and exerting the axial forces by squeezing the discs between the thumb and the fore finger of the right-hand.

The tetrahedral carbon atom represented by the interlocked discs is easily developed into a methane molecule by assembly of the chemical bond representing connections 12 to the nibs 22 of both the discs 20 and the hydrogen representing discs 14. it is to be understood that the whole alkane series of hydrocarbons with their derivatives can be developed by the use of a requisite number of interlocked discs 20 whose nibs 22 result in equal tetrahedral bond angles of 1095' and that many other basic hydrocarbon structures as well may be assembled and displayed by the components 10.

The invention which has been described represents an improvement over the known molecular model kits. The recessed tongues 22 of the atom representing components allow not only for more efficient storage but also for increased durability in usage. The snap-fitting feature in disc pairs positively locks the discs together into a stable unit which'resists accidental disassembly but which greatly facilitates assembly so that a minimum of skill or strength is required. Additionally, the use of a protruding lug, rather than an additional slot arrangement does not weaken the individual discs.

In a general manner, while there has been disclosed effective and efficient embodiments of the invention, it should be bodiments, as there might be changes made in the arrange- ,ment,'disposition, and form of the parts without departing from the principle of the present invention as comprehended within the scope of the accompanying claims.

1. Apparatus for constructing molecular models comprising a plurality of disc means for representing selected individual atoms, said disc means comprising a single disc for representing selected individual atoms, and multiple discs for representing other selected individual atoms, said multiple discs comprising a second thin circular disc, a third thin circular disc identical to the second disc, and interengaging means formed on said second disc and said third disc for snap-fitting said second'and third discs together, said interengaging means including a slot having planar parallel sides spaced-apart a distance equal to the thickness of the discs and extending outwardly from the center of each second disc and third disc to its periphery, said slot having a segment of increased width, a lug on each disc in longitudinal alignment with said slot and spaced outwardly from the center of the disc the same distance as said segment, wherein said first and second discs are rigidly interengaged in a mutually perpendicular relation when the lug of said second disc and the lug of said third disc are received in the enlarged slot segments of said. third and second discs respectively, valence-representing means formed inwardly from the periphery of said disc means for representing a chemical bond, said valence-representing means comprising at least one radial tongue formed inwardly of the peripheral portion of each disc, and means connecting together the valence-representing means of selected disc means, said connecting means comprising a hollow, slender tube adapted for snug receipt at either end of said tongue. 

1. Apparatus for constructing molecular models comprising a plurality of disc means for representing selected individual atoms, said disc means comprising a single disc for representing selected individual atoms, and multiple discs for representing other selected individual atoms, said multiple discs comprisiNg a second thin circular disc, a third thin circular disc identical to the second disc, and interengaging means formed on said second disc and said third disc for snap-fitting said second and third discs together, said interengaging means including a slot having planar parallel sides spaced-apart a distance equal to the thickness of the discs and extending outwardly from the center of each second disc and third disc to its periphery, said slot having a segment of increased width, a lug on each disc in longitudinal alignment with said slot and spaced outwardly from the center of the disc the same distance as said segment, wherein said first and second discs are rigidly interengaged in a mutually perpendicular relation when the lug of said second disc and the lug of said third disc are received in the enlarged slot segments of said third and second discs respectively, valencerepresenting means formed inwardly from the periphery of said disc means for representing a chemical bond, said valencerepresenting means comprising at least one radial tongue formed inwardly of the peripheral portion of each disc, and means connecting together the valence-representing means of selected disc means, said connecting means comprising a hollow, slender tube adapted for snug receipt at either end of said tongue. 